1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_ 6 #define ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_ 7 8 #include "ash/ash_export.h" 9 #include "ash/desktop_background/desktop_background_controller.h" 10 #include "base/memory/weak_ptr.h" 11 #include "base/observer_list.h" 12 #include "skia/ext/image_operations.h" 13 #include "third_party/skia/include/core/SkBitmap.h" 14 #include "ui/gfx/image/image_skia.h" 15 #include "ui/gfx/size.h" 16 17 namespace ash { 18 19 class WallpaperResizerObserver; 20 21 // Stores the current wallpaper data and resize it to |target_size| if needed. 22 class ASH_EXPORT WallpaperResizer { 23 public: 24 WallpaperResizer(int image_resource_id, 25 const gfx::Size& target_size, 26 WallpaperLayout layout); 27 28 WallpaperResizer(const gfx::ImageSkia& image, 29 const gfx::Size& target_size, 30 WallpaperLayout layout); 31 32 ~WallpaperResizer(); 33 34 const gfx::ImageSkia& wallpaper_image() const { return wallpaper_image_; } 35 const WallpaperLayout layout() const { return layout_; } 36 37 // Called on the UI thread to run Resize() on the worker pool and post an 38 // OnResizeFinished() task back to the UI thread on completion. 39 void StartResize(); 40 41 // Add/Remove observers. 42 void AddObserver(WallpaperResizerObserver* observer); 43 void RemoveObserver(WallpaperResizerObserver* observer); 44 45 private: 46 // Copies |resized_bitmap| to |wallpaper_image_| and notifies observers 47 // after Resize() has finished running. 48 void OnResizeFinished(SkBitmap* resized_bitmap); 49 50 ObserverList<WallpaperResizerObserver> observers_; 51 52 // Image that should currently be used for wallpaper. It initially 53 // contains the original image and is updated to contain the resized 54 // image by OnResizeFinished(). 55 gfx::ImageSkia wallpaper_image_; 56 57 gfx::Size target_size_; 58 59 WallpaperLayout layout_; 60 61 base::WeakPtrFactory<WallpaperResizer> weak_ptr_factory_; 62 63 DISALLOW_COPY_AND_ASSIGN(WallpaperResizer); 64 }; 65 66 } // namespace ash 67 68 69 #endif // ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_ 70